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Osteoporosis International

, Volume 27, Issue 1, pp 171–179 | Cite as

Low serum 25-hydroxyvitamin D is associated with increased risk of stress fracture during Royal Marine recruit training

  • T. Davey
  • S. A. Lanham-New
  • A. M. Shaw
  • B. Hale
  • R. Cobley
  • J. L. Berry
  • M. Roch
  • A. J. Allsopp
  • J. L. Fallowfield
Original Article

Abstract

Summary

The aim of this study was to investigate vitamin D status and stress fracture risk during Royal Marine military training. Poor vitamin D status was associated with an increased risk of stress fracture. Vitamin D supplementation may help to reduce stress fracture risk in male military recruits with low vitamin D status.

Introduction

Stress fracture is a common overuse injury in military recruits, including Royal Marine (RM) training in the UK. RM training is recognised as one of the most arduous basic training programmes in the world. Associations have been reported between serum 25-hydroxyvitamin D (25(OH)D) and risk of stress fracture, but the threshold of 25(OH)D for this effect remains unclear. We aimed to determine if serum 25(OH)D concentrations were associated with stress fracture risk during RM training.

Methods

We prospectively followed 1082 RM recruits (males aged 16–32 years) through the 32-week RM training programme. Troops started training between September and July. Height, body weight and aerobic fitness were assessed at week 1. Venous blood samples were drawn at weeks 1, 15 and 32. Serum samples were analysed for 25(OH)D and parathyroid hormone (PTH).

Results

Seventy-eight recruits (7.2 %) suffered a total of 92 stress fractures. Recruits with a baseline serum 25(OH)D concentration below 50 nmol L−1 had a higher incidence of stress fracture than recruits with 25(OH)D concentration above this threshold (χ2 (1) = 3.564, p = 0.042; odds ratio 1.6 (95 % confidence interval (CI) 1.0–2.6)). Baseline serum 25(OH)D varied from 47.0 ± 23.7 nmol L−1 in February, to 97.3 ± 24.6 nmol L−1 in July (overall mean 69.2 ± 29.2 nmol L−1, n = 1016). There were weak inverse correlations between serum 25(OH)D and PTH concentrations at week 15 (r = −0.209, p < 0.001) and week 32 (r = −0.214, p < 0.001), but not at baseline.

Conclusion

Baseline serum 25(OH)D concentration below 50 nmol L−1 was associated with an increased risk of stress fracture. Further studies into the effects of vitamin D supplementation on stress fracture risk are certainly warranted.

Keywords

25(OH)D Bone Military Physical training Stress fracture Vitamin D 

Notes

Acknowledgments

The authors would like to thank colleagues at the Commando Training Centre Royal Marines, Lympstone, Devon, UK, for their cooperation and support with this study. This work was funded by the UK Ministry of Defence.

Conflicts of interest

None.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2015

Authors and Affiliations

  1. 1.Environmental Medicine and ScienceInstitute of Naval MedicineGosportUK
  2. 2.Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical SciencesUniversity of SurreySurreyUK
  3. 3.University of ChichesterChichesterUK
  4. 4.Specialist Assay Laboratory, Clinical BiomechemistryManchester Royal InfirmaryManchesterUK
  5. 5.Clinical Laboratory Services, University Hospitals Birmingham NHS Foundation TrustQueen Elizabeth HospitalBirminghamUK

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